TOTON95/Guide_octave_ubuntu_cvx.md

## Guide_octave_ubuntu_cvx.md

      
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              Guide_octave_ubuntu_cvx.md
            
          
    Guide to install CVX into Octave / Ubuntu (16.10 & 18.04)

This guide was made using different solutions shared at the CVX forums and experimentation, to successfuly install the CVX tools into Octave running in Ubuntu 16.10 and 18.04.

Dependencies:

OpenBLAS
$ sudo apt-get install libopenblas-dev

Terminal

1.	Create a directory for the Octave tools and move into it

$ mkdir ~/your/path/to/Octave_dir/ && cd ~/your/path/to/Octave_dir/
2.	Clone the CVX tools (rework branch)

$ git clone -b rework https://github.com/cvxr/CVX.git/
3.	Move into the CVX directory

$ cd CVX
4.	The "git clone..." command will not copy the content in directories sedumi and sdpt3, since they are a link, they should be deleted

$ rmdir sedumi sdpt3
5.	Place the solvers into the Tool's directory

$ git clone https://github.com/sqlp/sdpt3.git

$ git clone https://github.com/sqlp/sedumi.git

OCTAVE

Using the Octave's Command Window:
1.	Move to the CVX directory in Octave

 cd ~/your/path/to/Octave_dir/CVX

1.5 (After Octave 5.0)

Change the function octave_config_info by _octave_config_info_ at cvx_version (line 50). Octave Ref
2. Run the CVX compiler

 cvx_compile

NOTE: If there are problems with the compilation just add the parameter '-rebuild'
3. Move to the sdpt3 directory in Octave and install the solver

 cd ~/your/path/to/Octave_dir/CVX/sdpt3

 install_sdpt3 -nopath

NOTE: If there are problems with the compilation just add the parameter '-rebuild'
4.  Move to the sedumi directory in Octave and install the solver

 cd ~/your/path/to/Octave_dir/CVX/sedumi

 install_sedumi -nopath

NOTE: It may be posible that this solver will be unable to compile due to the f77blas.h file, jump to ALTERNATIVE METHODS section and rebuild (add parameter '-rebuild')
 install_sedumi -nopath -rebuild

5. Move to the CVX directory and run cvx_setup

 cd ~/your/path/to/Octave_dir/CVX

 cvx_setup

The CVX is installed!


Alternative Methods

If you are having problems with the f77blas.h file try the following:
(A) Open the file blksdp.h at ~/your/path/to/Octave_dir/CVX/sedumi and replace the line:

#include <f77blas.h>
For

#include <openblas/f77blas.h>
Rebuild and continue with step 5.

 install_sedumi -nopath -rebuild

(B) Open the file blksdp.h at ~/your/path/to/Octave_dir/CVX/sedumi and replace the line:

#include <f77blas.h>
For

#include "cblas.h"
Also

#define FORT(x) BLASFUNC(x)
For

#define FORT(x) cblas_ ## x
Finally add this line next to the line mentioned above

typedef int blasint;
You may need to modify other files like sdmauxScalarmul.c at the same directory, pay attention to the compiler's messages.

Remove ampersand from functions like:
FORT(dscal)(&n,&alpha,x,&one);
to become
FORT(dscal)(n,alpha,x,one);
Rebuild and continue with step 5.

 install_sedumi -nopath -rebuild

These are the solutions by the moment. Feel free to ask anything about this procedure to the forum or to me. Best wishes and good luck!
References:
[1] http://ask.cvxr.com/t/cvx-on-octave-discussion/975/34
[2] http://ask.cvxr.com/t/cvx-on-octave-discussion/975/16